Retrieve posts from multiple categories

Yes, it would be good if I could figure out how to get X days.

Posts on this forum seem to disappear from view after a while, so only a good Google search brings back old posts and unanswered queries from long ago… ??

Ok, I finally figured out how to do multiple categories. Just pre-load your $posts var by using

query_posts(array(‘category__and’=>array(3,4,8)))

Where 3, 4, and 8 are the categories you want. Then call the loop like normal and magic.

Anyway, I have a whole write-up on it with code that shows how to make the categories multi-selectable and such here:

https://www.jeremyduffy.com/computers-internet/wordpress-stuff/wordpress-multiple-categories/

Jeremy, your code is good!
Any idea on how to keep the order and hierarchy in the list of categories to check?